Salome doesn't launch

Salome doesn't launch

I have a "little" problem:
I installed and launched Salome once and it seemed to work fine (I didn't have too much time to play with it).
The second time I wanted to run Salome, nothing happened!
I'm new to Linux as well as Salome so that can make it difficult for me to understand what is going on but now, when i start the appli, it initiates and then kills the program...